1877 Map by Japanese Cartographer, Mori Kinseki

The map also shows Ullungdo and its appended island, Dokdo. Notice that no parts of Japan are included on the map of Chosun (Korea).
Notice that Jukdo (Ullungdo) and Songdo (Dokdo) are both within the border of Chosun and coloured the same as Kangwon Province.

Maps from David Rumsey's collection at Berkley University (Special thanks to Steve Barber for providing the reference).